Albert Camus famously claimed that “A guilty conscience needs to confess. A work of art is a confession.” Spearing that sentiment into the heart of an exhibition’s thesis can be ostentatious and dangerously philosophical. But artist-curator Elsa Meléndez has pulled it off, somewhat, in “Vívidos / Vividos,” Dec. 29-Mar. 23, 2012, a group show about brutal personal truths at the Museo de Arte de Caguas in Puerto Rico.